On this day, the bustling West Street Square, where young people gathered to enjoy the summer vitality, Xiao Hui and Xia Tian agreed to meet here. Xia Tian accompanied Xiao Hui to sell an online virtual treasure. Unexpectedly, the object of this transaction was the bully among students---the three little dragons of Sakura, led by Kong Long! Xia Tian, A Jiang, Fang Wei, and BULU, the four classmates and good friends who grew up together in the old West Street, saw that Xiao Hui was in trouble, how could the other three sit idly by? So they had a conflict with Kong Long. Xiao Wei, one of the three little dragons of Sakura, saw that Kong Long was no match for A Jiang and the other four, so he cleverly asked for help from Councillor Kong. Councillor Kong then used his private power to exaggerate the whole incident, and the dispute between A Jiang and Kong Long became the headline of the newspaper the next day--"West Street Bully, Threatening with a Gun". The whole incident caused a stir in the entire Sakurano Academy campus. With the help of Xia Tian's father, Officer Xia, the principal asked Kong Long to reconcile with Jiang. However, at this time, Councillor Kong called and asked the principal to expel Jiang, Fang Wei and Bulu, which made the whole incident difficult to deal with again! Councillor Kong's call became the pressure for the principal to expel Jiang and others. Officer Xia, who is about to retire tomorrow, accidentally dropped his gun at Sakurano Academy while helping to resolve the dispute. The principal proposed that as long as Jiang and others helped Officer Xia find his gun, they would not be expelled. Will Jiang accept it? Where did Officer Xia drop his gun? A lost police gun and several students who may be expelled from school will unfold an incredible story at Sakurano Academy!